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Suspended germanium waveguide for infrared wavelengths

Suspended germanium waveguide for infrared wavelengths
Suspended germanium waveguide for infrared wavelengths
Silicon-on-insulator (SOI) is the dominant platform in near-infrared silicon photonics. However, the high absorption of SiO2 at wavelengths above 4 µm limits the range at which this material can be used in the mid-infrared wavelengths (2 - 20 µm). In this paper we review our recent investigation on suspended devices, building on our previous work based on suspended silicon devices with sub-wavelength grating (SWG) lateral cladding at 3.8 µm, followed by our more recent results at 7.67 µm. This platform which uses the well-known fabrication techniques of SOI, only requires a single lithographic etch step and it allows the use of the whole transparency range of the waveguide core material. Due to this, it could be a good candidate for sensing applications since the design covers a very large wavelength range. As the bottom cladding of the waveguide is air, the waveguide can be designed so that the mode is squeezed to increase the evanescent field proportion and therefore the interaction with a surrounding analyte.
IEEE
Soler Penadés, J.
f18f3619-0d71-4547-95fd-dd38c37b7adb
Sánchez-Postigo, A.
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Nedeljkovic, M.
37c34ba1-59e5-44ba-a55f-60e65f920560
Wangüemert-Perez, G.
16d68466-be7e-44e5-b7ef-06df722d24af
Ortega-Moñux, A.
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Halir, R.
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Khokhar, A.Z.
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Osman, A.
eb387b50-c718-47df-ac90-97b2efd3e335
Cheben, P.
9a2e25a5-6aa0-414e-a061-23416efedebc
Molina-Fernández, I.
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Mashanovich, G.Z.
c806e262-af80-4836-b96f-319425060051
Soler Penadés, J.
f18f3619-0d71-4547-95fd-dd38c37b7adb
Sánchez-Postigo, A.
81499766-b4c1-48ce-8143-9bdd49621d81
Nedeljkovic, M.
37c34ba1-59e5-44ba-a55f-60e65f920560
Wangüemert-Perez, G.
16d68466-be7e-44e5-b7ef-06df722d24af
Ortega-Moñux, A.
1ddc0007-ad93-424f-909e-1891ebd4973e
Halir, R.
e3f8d90b-0067-4e1a-a6b1-0217c342dd55
Khokhar, A.Z.
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Osman, A.
eb387b50-c718-47df-ac90-97b2efd3e335
Cheben, P.
9a2e25a5-6aa0-414e-a061-23416efedebc
Molina-Fernández, I.
9a123b9e-a12a-417e-b35d-f55d589af32b
Mashanovich, G.Z.
c806e262-af80-4836-b96f-319425060051

Soler Penadés, J., Sánchez-Postigo, A., Nedeljkovic, M., Wangüemert-Perez, G., Ortega-Moñux, A., Halir, R., Khokhar, A.Z., Osman, A., Cheben, P., Molina-Fernández, I. and Mashanovich, G.Z. (2019) Suspended germanium waveguide for infrared wavelengths. In 2019 21st International Conference on Transparent Optical Networks (ICTON). IEEE. 3 pp . (doi:10.1109/ICTON.2019.8840022).

Record type: Conference or Workshop Item (Paper)

Abstract

Silicon-on-insulator (SOI) is the dominant platform in near-infrared silicon photonics. However, the high absorption of SiO2 at wavelengths above 4 µm limits the range at which this material can be used in the mid-infrared wavelengths (2 - 20 µm). In this paper we review our recent investigation on suspended devices, building on our previous work based on suspended silicon devices with sub-wavelength grating (SWG) lateral cladding at 3.8 µm, followed by our more recent results at 7.67 µm. This platform which uses the well-known fabrication techniques of SOI, only requires a single lithographic etch step and it allows the use of the whole transparency range of the waveguide core material. Due to this, it could be a good candidate for sensing applications since the design covers a very large wavelength range. As the bottom cladding of the waveguide is air, the waveguide can be designed so that the mode is squeezed to increase the evanescent field proportion and therefore the interaction with a surrounding analyte.

Full text not available from this repository.

More information

e-pub ahead of print date: 9 July 2019
Published date: 19 September 2019
Venue - Dates: 21st International Conference on Transparent Optical Networks, ICTON 2019, France, 2019-07-09 - 2019-07-13

Identifiers

Local EPrints ID: 441770
URI: http://eprints.soton.ac.uk/id/eprint/441770
PURE UUID: f4dcbdbd-6403-4486-8de5-73470b632f8f
ORCID for J. Soler Penadés: ORCID iD orcid.org/0000-0002-1706-8533
ORCID for A. Osman: ORCID iD orcid.org/0000-0001-6575-3861

Catalogue record

Date deposited: 26 Jun 2020 16:31
Last modified: 09 Sep 2020 01:45

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